Transmission device and repeater

Abstract

A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical main signal. A fault occurrence recognizing part detects a pump light used for an opposing device via an optical fiber transmission line to which an optical main signal is sent by the repeater. If the pump light is not detected, the fault occurrence recognizing part recognizes occurrence of a fault. A light cutoff control part stops the optical amplifying part outputting an amplified signal so that the light cutoff control in only one of two directions is performed when a fault occurs.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]The present invention relates to transmission devices and repeaters, and more particularly, to an optical transmission device and an optical repeater.[0003](2) Description of the Related Art[0004]An increase in the transmission capacity because of recent remarkable development of the Internet has stimulated quick spreading of the optical communications network technique WDM (Wavelength Division Multiplex). WDM multiplies lights of different wavelengths and simultaneously transmits a plurality of multiplied signals over a single optical fiber.[0005]In WDM systems, long-distance transmission has been realized in such a way that the optical signal is not converted into an electric signal at each repeater station due to the cost but is amplified by an optical amplifier.[0006]The amplified signal from the optical amplifier is at a high level. If a fault occurs in the optical fiber transmission line or the optical transmissi...

AI Technical Summary

Benefits of technology

[0025]Taking into consideration the above, an object of the present invention is to provide a transmission system capable of performing optical transmission control directed to improving workability and service quality when a fault occurs.

[0026]It is another object of the present invention to provide a repeater capable of performing optical transmission control directed to improving workability and service quality when a fault occurs.

Problems solved by technology

This situation is dangerous.

For example, the dangerous situation will occur when the optical fiber cable is disconnected or pulled off from a unit.

Breaking the channels having high traffic in response to disconnection of the channels having low traffic would degrade work efficiency and service quality.

Images